Cookies

2 cups sifted all-purpose flour, 1 teaspoon baking soda, 1 teaspoon cornstarch, 1/2 teaspoon

1 and 3/4 cups all-purpose flour, 1 teaspoon baking powder, 1/4 teaspoon salt, 1 teaspoon vanilla

3/4 cups unsalted butter (room temperature), 1/2 cup white granulated sugar, 3/4 cup brown